#include <stdio.h>
int func(int x){
    return x*x*x*x;
}

void main(){
    int i,x;
    double y = 0;
    for ( i = 1; i <= 20; i++)
    {
        printf("please input X:");
        scanf("%d",&x);
        y = y+func(1.5*x+6);
    }
    printf("the outcome = %f",y);
}